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Meet the cranium of Steinheim

The cranium of Steinheim, Germany, is probably the most strange mix of hominin characteristics in the European Middle Pleistocene.

It is assigned by many authors to Homo heidelbergensis, but this specimen actually supports the hypothesis against the definition of Homo heidelbergensis as a single umbrella of multiple fossils from a wide range of geographies: Mauer, Vértesszőllős, Bilzingsleben, Arago, Petralona, Bodo, Broken Hill, Dali and other Middle Pleistocene findings. These are not assigned to Homo erectus, but we do not have a full understanding of the migration flows that clearly could justify assigning all of them to just one species. Such theories even propose that Neandertals and H. sapiens may have had another chronological preceding species, apart from H. heidelbergensis. even propose that Neandertals and H. sapiens may have had another chronological preceding species, apart from H. heidelbergensis. Steinheim is also being considered as Early Neandertal, together with other European Middle Pleistocene specimens such as the Sima de los huesos population.

Steinheim skull is gracile and seems to be a female of 250-350 ka. Its size is smaller and its cranial features are less robust in comparison to other European remains like Arago XXI or Petralona 1. Actually the only clear Neandertal feature is the occipital bun, while many other features anticipates Homo sapiens: for example the presence of canine fossa, and the face which is longer, smaller and flatter than the Neandertal face.

Steinheim cranium. Photo: Roberto Sáez

Steinheim cranium. Photo: Roberto Sáez

It retains some primitive characters though, intermediate between Homo erectus and H. sapiens, such as the heavy browridges and the small cranial capacity of 1100 cc, similar to Cranium 5 from the Sima de los Huesos in Atapuerca. The quite spherical braincase is similar in shape to that of Homo sapiens.

Nice article, but not up to date, and a couple inaccuracies. The Steinheim skull isn’t even remotely gracile. It has a brow ridge larger than any male Neanderthal and its face is not longer than a Neanderthal’s. Steinheim’s nasion-prosthion height is a mere 74mm — in adult Neanderthal males this measurement ranges from 82-94mm.

The occipital bun is also not the only Neanderthal trait the skull has (several Neanderthals such as La Ferrassie also lack an occipital bun). With the sequencing of the Sima de los Huesos remains revealing that they are Neanderthals, the “Heidelbergensis” taxon has been abandoned as a concept.

I appreciate your comments, thank. My responses below:
I still think it is gracile – this is an obvious result when comparing vs Arago XXI or Petralona 1 etc.
82% of neandertals have a fully developed occipital bun (Cartmill, Smith).
The heidelbergensis taxon is under revision which doesn’t mean abandoned.
The Sima fossils are no longer heidelbergensis – this is stated in my article above as well as in https://nutcrackerman.com/2016/11/09/a-moment-of-silence-for-the-death-of-homo-heidelbergensis/
I agree about the large brow widge of Steinheim.